Floor grid



Oct. 18 1927. 1,645,538

A. s. MACDONALD FLopR GRID i Filed July 1, 1924 2 $heets-$heet 1 a v v QI IN N m (s N 5 QW Q I I I +1 INVENTOR A A TTORNE Y6 Oct. 18 1927.1,645,538

A. s MACDONALD FLOOR GRID Filed July 1. 1924 2 Sheets-Sheet 2 WYM ATTORNE Y5 Patented Oct. 18, 1927.

UNITED s'rn'rss PATENT OFFICE.

ANGUS S. MACDON ALD, F QREAT NECK, NEW YORK, ASSIGNOR TO SNEAD PANY, ACORPORATION OF NEW JERSEY. i

& COM- FLOOR GRID.

Application filed July 1,

This invention relates to metallic floor grids for taking up Wear onasphalt or con-. crete floors subject to heavy traffic or hard usage.

6 One of the primary objects of my invention is to provide a grid whichis adapted to interlock with adjacent similar grids when the fillingmaterial is applied.

Another object of my invention is to provide a counterpart grid whichwhen a multiplicit-y thereof are assembled and filling niaterial appliedwill expose a metallic wearin surface of uniform design.

ltill another object of my invention is to 1 provide a grid which whenfilled with floor material will prevent cupping out of the fillingmaterial with wear.

Still another object of my invention is to provide a cast grid in whichthe draft a1- lowance slopes in such manner to anchor the grid securelywhen the filling material is applied.

Still another object of my invention is to provide a grid in which everyportion is tied together thus producing a rigidly constructed rid.

S iill another object of my invention is to provide a. gridwhich can beeasily leveled when surfacing a rough floor.

A more specific object of my invention is to provide a grid in which themain walls are of uniform depth and consequently of uniform strength.How these and various other ob ects and i 85 advantages can be realizedthrough my nvention Will appear from my description hereinafter of" thebest construction for the purpose known to me In the drawings, Fig. 1 isa plan view of a com lete rid.

Fig. 2 i-s a section taken on line 2-2 of Fig. l with a fragment of theleft and right adjacent grids in assembled position.

Fig. 3 is a section taken on line 3-3 of Fig. 1. V

Fig. 4 is a section taken on line 4- of Fig. 1 with a fragment of itsadjacent grids in assembled position.

Fig. 5 is a fragmentary plan view showing how adjacent grids over ap atthe corners to produce a uniformdesign.

F1 6 is a fragmentary plan View of a comp leted portion of the floor,and n Fig. 7 is a fragmentary section at a point 1924. Serial No.723,440.

where adjacent grids meet showing a feature of my invention for locatingthe grids. The preferred form of grid illustrated is a metal casting,the main portion thereof being comprisedv of a plurality of intersectingbars land 2, which form the pockets A for receiving a mastic or fillingmaterial such as asphalt or concrete for instance. Intermediate thepoints of intersection .I have provided the fingers 3' extending intoand terminating short of the center of the pockets thus reducing theunprotected surface included in the large squares andaffol-ding a largearea of metal protection with a minimum quantity of metal. Similarlingers 3 extend outwardly from the edge portions at and 5. g V

The contiguous edge portions 4 and"5 are constructed to overhang and thetwo edges 6 and 7 opposite thereto are constructed to underhang. By thisconstruction the grids are adapted to he used as complements in coveringa large area. The underhung portions 6 and 7 are provided with halfpockets B, and are, cut down in height so as to be substantially onehalf the height of the main pockets A, with the exception of the endfingers 6* Which are of the same height as the intersecting bars. Thusitwill be seen in assembling a series of grids that these underhungportions can slip under the overhung portions of the next adjacentsections, which portions are cut down in depth in an amount to allowthis to be. done. When thus assembled, the side or end walls 8 of theportions 4 and 5 overlie the inside walls 9 of the portions 6 and 7, andthe fingers 3 and bars 1 and 2 overlie the outside walls 1 0 and bars 1*and 2* thereof,- thus forming superimposed pockets which when filledwith mastic will become securely interlocked, and

at the same time will present a uniform design of the exposed metalwork. To main minimum the clearance between the top por-.

tions of the bars'where two grids meet,

As the grids are cast and used without any machining it is necessary toprovide clearance between the lower surface of the overhang of one gridand the upper surface of the underhang of its adjacent grid, in order toprevent these surfaces from coming in contact and causing the grids torock on account of irregularities in the casting or in the rough flooror setting. This clearance is indicated in Figs. 2 and 4.

It is to be noted that this gap is so slight that there is a possibilitythat the filling material would not flow therein, thus leaving theoverhung portion unsupported and creating a weakness. In order toovercome this disadvantage I have made the walls 8 of the overhangingportions I and 5 of the grids which overlie the walls 9 of theunderhanging portions 6 and 7 of adjacent grids, so that they do notexactly line up vertically with the walls 9 which causes overlap at 14,see Figs. 2 and 4. Hence the filling ma terial when applied forms asupport under the overlap of the walls, insuring adequate support atthese points.

By making the casting so that the parting line falls intermediate theupper and lower 39 surfaces of the grid, causing the draft to enables meto make the main walls of the grid of uniform depth and strength.

It is to be understood that in order to have a maximum wearing surfacewith a minimum amount of material I may construct the fingers 3 toextend only above the substantial center line of the main walls."

By choosing the kind of metal of which the grids are made and the kindof mastic into.which they are bedded a floor'can be built up that maybe, acid, heat, or wear resisting or all of them together.

I claim:

1. A fioor grid having edge pockets so constructed that; when aplurality of grids are assembled the pockets of one edge of a grid. aresuperimposed over edge pockets of the. adjacent grid'and interlockedwhen the floor material. is applied. a

2. A grid having underhung and over-- hung edge portions whereby when aplurality of grids are assembled the overhang .0 portions of one gridoverlie the underhung portions of an adjacent grid, said portions beingso disposed with respect to one another that the overhung portions aresupported by the filling material.

3. A floor grid comprised of intersecting bars providing pockets, eachbar being provided with oppositely projecting fingers extending into thepockets located on either side of said bar.

4. A floor grid comprised of intersecting bars providing pockets, eachbar being provided with fingers extending into the pocket butterminating short of the center thereof.

5. A floor grid comprised of intersecting bars providing pockets, andleveling bosses Extending downward from the intersecting dl'S.

6. In combination, a pair-of floor grid sections arranged for assemblytogether and each comprising a plurality of intersecting bars, themeeting edge of one of said grid sections being characterized by theprovision of a longitudinally extending bar formed with a plurality ofspaced notches for receiving the adjoining ends of the transverse lyextending bars of tions.

7 A floorgrid composed of intersecting the other of said secbars andhaving contiguous edge portions provided with a plurality of notchesopposite the termini of said bars, said notches extending substantiallytransversely of the plane of the grid and adapted to receive xbars ofadjacent grids whereby a uniform floor design will be formed when aplurality of grids are assembled.

. 8. A floor grid composed of intersecting bars forming pockets, andfingers extending laterally from-said bars, two contiguous edge bars ofsaid grid having notches between the fingers extending substantiallytransversely of the plane of the grid and adapted to engage bars ofadjacent grids toahne the grids laterally when a plurality 'thereof areassembled.

9. A floor grid composed of intersecting bars and having an overhungedge portion and an under-hung edge portion with notches in one of saidportions, said portions being adapted tocooperate with complementaryparts of adjacent grids for vertical alinement of said grids and forinterlocking of the grids by means of the floor n'laterial, and saidnotches being adapted to engage bars of adjacent grids for horizontalalinement of the grids.

. In' testimony whereof, I have hereunto signed my. name.

ANGUS, s. MACDONALD.

